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This content comes from Closed Captioning that was broadcast along with this program.

>>>story that gives new meaning to the problem of unbearable neighbors. we are talking about
polar bears
that invade a
northern canada
town for years and have done so with a vengeance this year. it may have to do with
climate change
.

>> reporter: where the
polar bears
roam in
churchill
, canada, the
street signs
are a little different. here, 800 people and some 900
bears
try to co-exist from late june to late november when the
sea ice
disappears in
hudson bay
and the
bears
come on land to wait for the ice to reform. this year the animals that attract 10,000 tourists to the town are in some cases being anything but neighborly.

>>we have had two different attacks on people.

>> reporter: three resident injured by
bears
in two incidents leaving some to wonder if
climate change
is starving thebears. hereou can see a mother and cub. ey sm to b feasting on the kelp on the shoreline, but the
polar bears
' favorite pemeal is
ring seal
. to get it they need
sea ice
. the device is the hunting platform. instead of lasting eight months in
hudson bay
scientists say the ice only lasts seven which means th
bears
are on land a month longer without food.

>>the question is are they actually seeking people as food. the jury is out on that. we're not sure.

>> reporter: the town of
churchill
is on the
bears
' path back to the ice. if they get to close the
bears
are lured into giant traps or rounded up by conservation officers. next stop,
polar bear
jail.

>>prior to having the holding facility the
bears
were mainly captured, immobilized, flown out the same day. they were finding it was a race to get back to town.

>> reporter: now the
bears
can spend up to
30 days
in an attempt to keep them from becoming repeat offenders.

>>on most years we hold for
bears
than the police hold people.

>> reporter: a struggle to maintain a relationship that works best when both parties keep their distance.
anne thompson
, nbc news,
churchill
, canada.